Tint Meter "Tint-Chek" Window Sensor - 100% Made in USA Comes equipped with a protective carrying case, two NIST calibration standards, and a 9-volt battery. Rugged and made with quality components that will last for years! Perfect for tint applicators or law enforcement officials to check the legality of automotive window tint. Patent-pending techniques remove ambient light conditions that may be changing in the testing environment such as stray headlights or cloud cover. Made in the USA with all digital, micro-processor controlled electronics.